fix: 多项修复 — 滴数框/零售价显示/精油英文名保存/再次审核通知

1. 编辑配方的滴数输入框从 42px 加宽到 58px，确保 50.5 不被 spinner 遮挡
2. 配方卡片在零售价==会员价时也显示零售价（之前因 retail>cost 过滤掉）
3. 精油价目英文名保存后被静态 OIL_CARDS 覆盖，把 getEnglishName 的优先级改
   为先用 DB meta.enName，解决温柔呵护/仕女呵护等显示不更新的问题
4. 再次审核 tag 的配方被非管理员修改时，给管理员发通知，内容含前后 diff
5. 对应 vitest + cypress 测试各一组

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/views/RecipeManager.vue

@@ -2114,7 +2114,7 @@ watch(() => recipeStore.recipes, () => {
 .editor-table th { text-align: center; padding: 6px 4px; color: #999; font-weight: 500; font-size: 12px; border-bottom: 1px solid #eee; }
 .editor-table th:first-child { text-align: left; }
 .editor-table td { padding: 6px 4px; border-bottom: 1px solid #f5f5f5; }
-.editor-drops { width: 42px; padding: 5px 2px; border: 1.5px solid #d4cfc7; border-radius: 8px; font-size: 13px; text-align: center; outline: none; font-family: inherit; }
+.editor-drops { width: 58px; padding: 5px 4px 5px 6px; border: 1.5px solid #d4cfc7; border-radius: 8px; font-size: 13px; text-align: center; outline: none; font-family: inherit; }
 .editor-drops:focus { border-color: #7ec6a4; }
 .drops-with-unit { display: flex; align-items: center; gap: 2px; }
 .unit-hint { font-size: 11px; color: #b0aab5; white-space: nowrap; }